CSS中渐变的渐变

div {
  position: relative;
  height: 300px;
  width: 500px;
}
div svg {
  position: absolute;
  height: 100%;
  width: 100%;
}
div .grad-fill {
  fill: url(#grad);
  mask: url(#masker);
}

<div>
  <svg viewBox="0 0 500 300" preserveAspectRatio="none">
    <defs>
      <linearGradient id="grad" gradientUnits="objectBoundingBox" gradientTransform="rotate(270,0.5,0.5)">
        <stop offset="0%" stop-color="rgba(198,83,165,.95)" />
        <stop offset="100%" stop-color="rgba(198,86,51,.95)" />
      </linearGradient>
      <linearGradient id="mask-grad" gradientUnits="objectBoundingBox">
        <stop offset="40%" stop-color="black" />
        <stop offset="100%" stop-color="white" />
      </linearGradient>
      <mask id="masker" x="0" y="0" width="500" height="300">
        <rect x="0" y="0" width="500" height="300" fill="url(#mask-grad)" />
      </mask>
    </defs>
    <rect x="0" y="0" width="500" height="300" class="grad-fill" />
  </svg>
  <img src="http://lorempixel.com/500/300/animals/8" />
</div>

div {
  position: relative;
  height: 300px;
  width: 500px;
  color: white;
}
div:after,
img {
  position: absolute;
  height: 100%;
  width: 100%;
  top: 0px;
  left: 0px;
  z-index: -1;
}
div:after {
  content: '';
  background-image: linear-gradient(0deg, rgba(198, 83, 165, .95) 0%, rgba(198, 86, 51, .95) 100%);
  -webkit-mask-image: linear-gradient(90deg, transparent 40%, rgb(0, 0, 0) 100%);
}

<div>Some text
  <img src="http://lorempixel.com/500/300/animals/8" />
</div>